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3,515 Matching Results
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A computer-controlled automated test system for fatigue and fracture testing
A computer-controlled system consisting of a servohydraulic test machine, an in-house designed test controller, and a desktop computer has been developed for performing automated fracture toughness and fatigue crack growth testing both in the laboratory and in hot cells for remote testing of irradiated specimens. Both unloading compliance and dc-potential drop can be used to monitor crack growth. The test controller includes a dc-current supply programmer, a function generator for driving the servohydraulic test machine to required test outputs, five measurement channels (each consisting of low-pass filter, track/hold amplifier, and 16-bit analog-to-digital converter), and digital logic for various control and data multiplexing functions. The test controller connects to the computer via a 16-bit wide photo-isolated bidirectional bus. The computer, a Hewlett-Packard series 200/300, inputs specimen and test parameters from the operator, configures the test controller, stores test data from the test controller in memory, does preliminary analysis during the test, and records sensor calibrations, specimen and test parameters, and test data on flexible diskette for later recall and analysis with measured initial and final crack length information. During the test, the operator can change test parameters as necessary. 24 refs., 6 figs.
Date:
January 1, 1989
Creator:
Nanstad, R. K.; Alexander, D. J.; Swain, R. L.; Hutton, J. T. & Thomas, D. L.
Object Type:
Article
System:
The UNT Digital Library
Remote-controlled NDA (nondestructive assay) systems for feed and product storage at an automated MOX (mixed oxide) facility
Nondestructive assay (NDA) systems have been developed for use in an automated mixed oxide (MOX) fabrication facility. Unique features have been developed for the NDA systems to accommodate robotic sample handling and remote operation. In addition, the systems have been designed to obtain International Atomic Energy Agency inspection data without the need for an inspector at the facility at the time of the measurements. The equipment is being designed to operate continuously in an unattended mode with data storage for periods of up to one month. The two systems described in this paper include a canister counter for the assay of MOX powder at the input to the facility and a capsule counter for the assay of complete liquid-metal fast breeder reactor fuel assemblies at the output of the plant. The design, performance characteristics, and authentication of the two systems will be described. The data related to reliability, precision, and stability will be presented. 5 refs., 10 figs., 4 tabs.
Date:
January 1, 1989
Creator:
Menlove, H. O.; Augustson, R. H.; Ohtani, T.; Seya, M.; Takahashi, S.; Abedin-Zadeh, R. et al.
Object Type:
Article
System:
The UNT Digital Library
Remote controlled signal conditioner and fiber optic data link system development CPRF (Confinement Physics Research Facility)
The ZTH reversed-field pinch to be installed in the Confinement Physics Research Facility (CPRF) will produce a significant ambient magnetic field. To avoid ground-loop and other electrical problems, the diagnostics in direct or possible contact with the experiment will be accessed through a fiber optic data way. The frequency-modulated analog links developed for this system have a bandwidth of dc to 100 kHz and a signal-to-noise ratio of better than 60 dB. The fiber optic transmitter units include a signal conditioner and a microprocessor controller. The conditioners can be configured as dc-coupled, low-noise differential amplifiers, or as high-gain, low-drift differential integrators with a very long droop time constant. Magnetic field pickup is minimized by balancing sensitive circuit areas to within 5 mm{sup 2} in all three planes of the PC boards. The gain, offset, and integrator reset are controlled and monitored by the microprocessor, and their status is displayed on the front panel of the transmitter unit. The signal conditioner can be controlled locally, or by way of a fiber optic coupled control network. The system allows fast, convenient, noise-immune control of a large number of signal conditioners from a central host computer. By varying the offset, the computer can …
Date:
January 1, 1989
Creator:
Schrank, L.S.; Caudill, L.D.; Haberstich, A.; Klare, K.A. & Reass, W.A.
Object Type:
Article
System:
The UNT Digital Library
Improving Access to Music: A Report of the MLA Music Thesaurus Project Working Group
This article reports on the work of the Music Library Association (MLA) Music Thesaurus Project Working Group.
Date:
June 1, 1989
Creator:
McKnight, Mark, 1951-
Object Type:
Review
System:
The UNT Digital Library
A List of Indigenous Fish, Shellfish, and Aquatic Plant Species of Texas
Report documenting the process of compiling indigenous species to Texas public waters, for the purpose of later identifying exotic species. It includes the full list of native species of fish, shellfish and aquatic plants in Texas with scientific name and common name.
Date:
1989
Creator:
Harvey, William D.; Neck, Raymond W.; Johnson, N. Joyce; Garrett, Gary P.; Howells, Robert G. & Cody, Terry J.
Object Type:
Report
System:
The Portal to Texas History
Tectonically Controlled Fan Delta and Submarine Fan Sedimentation of Late Miocene Age, Southern Temblor Range, California
From introduction: The objectives of this report are to (1) document the stratigraphic framework of the Santa Margarita Formation and part of the Monterey Shale in the southern Temblor Range, (2) interpret the environments of deposition and depositional processes of the above units, and (3) evaluate the influence of tectonism on Santa Margarita sedimentation, with special attention given to testing the hypothesis of Berry and others (1968).
Date:
1989
Creator:
Ryder, Robert T. & Thomson, Alan
Object Type:
Report
System:
The UNT Digital Library
A Fermi Liquid Electric Structure and the Nature of the Carriers in High-T/sub c/ Cuprates: A Photoemission Study
We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high-T/sub c/ cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshapes of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals on the calculations, while the energy positions of the peaks agree with calculated bands only to within /approx/0.5 eV. This may yet prove to reflect the effects of Coulomb correlation. We nevertheless conclude that a Fermi liquid approach to conductivity is appropriate. Angle-resolved data, while still incomplete, suggest agreement with the Fermi surface predicted by the LDA calculations. A BCS-like energy gap is observed in the 2:2:1:2 materials, whose magnitude is twice the weak coupling BCS value (i.e., 2/Delta/ = 7 KT/sub c/). 49 refs., 11 figs.
Date:
January 1, 1989
Creator:
Arko, A. J.; List, R. S.; Bartlett, R. J.; Cheong, S. W.; Fisk, Z.; Thompson, J. D. et al.
Object Type:
Article
System:
The UNT Digital Library
Peak load management: Potential options
This report reviews options that may be alternatives to transmission construction (ATT) applicable both generally and at specific locations in the service area of the Bonneville Power Administration (BPA). Some of these options have potential as specific alternatives to the Shelton-Fairmount 230-kV Reinforcement Project, which is the focus of this study. A listing of 31 peak load management (PLM) options is included. Estimated costs and normalized hourly load shapes, corresponding to the respective base load and controlled load cases, are considered for 15 of the above options. A summary page is presented for each of these options, grouped with respect to its applicability in the residential, commercial, industrial, and agricultural sectors. The report contains comments on PLM measures for which load shape management characteristics are not yet available. These comments address the potential relevance of the options and the possible difficulty that may be encountered in characterizing their value should be of interest in this investigation. The report also identifies options that could improve the efficiency of the three customer utility distribution systems supplied by the Shelton-Fairmount Reinforcement Project. Potential cogeneration options in the Olympic Peninsula are also discussed. These discussions focus on the options that appear to be most …
Date:
October 1, 1989
Creator:
Englin, J. E.; De Steese, J. G.; Schultz, R. W. & Kellogg, M. A.
Object Type:
Report
System:
The UNT Digital Library
Bibliography of high-T/sub c/ superconducting films
This document represents an effort to make bibliographic information on high-T/sub c/ superconductor films available to those who cannot access the on-line database at the Westinghouse R and D Center. The database contains a growing list of references -- approaching 5000 -- each of which is identified by a set of two-letter keywords. The database is used the same way as as INSPEC's, but its fixed set of standard keywords enables the user to obtain a complete list of references on keyworded topics. Since a single keyword (or search term) such as ''sputtering'' creates a bibliography that is too long for practical use, the database is used most effectively by combining a series of keywords using Boolean algebra to identify a handful of relevant references. The structure of this document is intended to present the subset of papers concerning high-T/sub c/ films (725 papers) in a compact format as a substitute for on-line searches. Rather than listing separate bibliographies for each of the 185 keywords, a single list of all the references is contained in Section 6, and indices based on the keywords are contained in Sections 3--5. This report is a true bibliography and does not contain any informative …
Date:
January 1, 1989
Creator:
Talvacchio, J.
Object Type:
Report
System:
The UNT Digital Library
High-speed electrical motor evaluation
Under this task, MTI conducted a general review of state-of-the-art high-speed motors. The purpose of this review was to assess the operating parameters, limitations and performance of existing motor designs, and to establish commercial sources for a motor compatible with the requirements of the Brayton-cycle system. After the motor requirements were established, a list of motor types, manufacturers and designs capable of achieving the requisite performance was compiled. This list was based on an in-house evaluation of designs. Following the establishment of these options, a technical evaluation of the designs selected was conducted. In parallel with their evaluations, MTI focused on the establishment of commercial sources.
Date:
February 3, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Cryo Utilities Room Cooling System
Many of the mechanical equipment failures at the Laboratory are due to the loss of cooling water. In order to insure the proper operating temperatures and to increase the reliability of the mechanical equipment in the D0 Cryo Utilities Room it is necessary to provide an independent liquid cooling system. To this end, an enclosed glycoVwater cooling system which transfers heat from two vane-type vacuum pumps and an air compressor to the outside air has been installed in the Cryo Utilities Room. From the appended list it can be seen that only the Thermal Precision PFC-121-D and Ingersoll-Rand WAC 16 deserve closer investigation based on price. The disadvantages of the WAC 16 are that: it runs a little warmer, it requires more valving to properly install a backup pump, inlet and outlet piping are not included, and temperature and pressure indicators are not included. Its only advantage is that it is $818 cheaper than the PFC-121-D. The advantages of the PFC-121-D are that: it has automatic pump switching during shutdown, it has a temperature regulator on one fan control, it has a switch which indicates proper operation, has a sight glass on the expansion tank, and comes with an ASME …
Date:
January 26, 1989
Creator:
Ball, G. S.
Object Type:
Report
System:
The UNT Digital Library
Evaluate and characterize mechanisms controlling transport, fate, and effects of army smokes in the aerosol wind tunnel: Transport, transformations, fate, and terrestrial ecological effects of hexachloroethane obscurant smokes
The terrestrial transport, chemical fate, and ecological effects of hexachloroethane (HC) smoke were evaluated under controlled wind tunnel conditions. The primary objectives of this research program are to characterize and assess the impacts of smoke and obscurants on: (1) natural vegetation characteristic of US Army training sites in the United States; (2) physical and chemical properties of soils representative of these training sites; and (3) soil microbiological and invertebrate communities. Impacts and dose/responses were evaluated based on exposure scenarios, including exposure duration, exposure rate, and sequential cumulative dosing. Key to understanding the environmental impacts of HC smoke/obscurants is establishing the importance of environmental parameters such as relative humidity and wind speed on airborne aerosol characteristics and deposition to receptor surfaces. Direct and indirect biotic effects were evaluated using five plant species and two soil types. HC aerosols were generated in a controlled atmosphere wind tunnel by combustion of hexachloroethane mixtures prepared to simulate normal pot burn rates and conditions. The aerosol was characterized and used to expose plant, soil, and other test systems. Particle sizes of airborne HC ranged from 1.3 to 2.1 {mu}m mass median aerodynamic diameter (MMAD), and particle size was affected by relative humidity over a range …
Date:
September 1, 1989
Creator:
Cataldo, D. A.; Ligotke, M. W.; Bolton Jr., H.; Fellows, R. J.; Van Voris, P.; McVeety, B. D. et al.
Object Type:
Report
System:
The UNT Digital Library
Philosophical Society of Texas, Proceedings of the Annual Meeting: 1988
Proceedings of the annual meeting of the Philosophical Society of Texas held December 2 & 3, including a list of attendees, text of addresses, changes to membership, and biographical information about members who have passed. The theme of the conference was "Future of School Finance in Texas."
Date:
1989
Creator:
Philosophical Society of Texas
Object Type:
Book
System:
The Portal to Texas History
Environmental Guidance Program Reference Book: Endangered Species Act and the Fish and Wildlife Coordination Act. Revision 5
The Endangered Species Act and the Fish and Wildlife Coordination Act are major federal statutes designed to protect plant and animal resources from adverse effects due to development projects. Both Acts require consultation with wildlife authorities prior to committing resources to certain types of projects. The purposes and requirements of the two statutes are summarized in the following subsections. Also presented is a list of contacts in the regional and field offices of the US Fish and Wildlife Service.
Date:
January 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Proceedings of the Fourteenth DOE solar photochemistry research conference
The central themes of this year's Solar Photochemistry Research Conference encompassed initial charge separation in photosynthesis, photoinduced charge separation in other organized assemblies, electron transfer, organic and inorganic photochemistry, and photoelectrochemistry. This volume contains a copy of the program the abstracts of 29 formal presentations and 47 posters, a record of the discussion following each presentation, and an address list for the 96 attendees. Individual projects are processed separately for the databases. .
Date:
January 1, 1989
Creator:
unknown
Object Type:
Article
System:
The UNT Digital Library
A versatile stepping motor controller for systems with many motors
A versatile system for controlling beamlines or complex experimental setups is described. The system as currently configured can control up to 32 motors, with all motors capable of full speed operation concurrently. There are 2 limit switch inputs for each motor, and a further input to accept a reference position marker. The motors can be controlled via a front panel keyboard with display, or by a host computer over an IEEE-488 interface. Both methods can be used together if required. There is an emergency stop'' key on the front panel keyboard to stop the motion of all motors without losing track of the motors' position. 3 refs., 4 figs., 1 tab.
Date:
January 1, 1989
Creator:
Feng, S. K. & Siddons, D. P.
Object Type:
Article
System:
The UNT Digital Library
The Voice of the Composer: Theory and Practice in the Works of Pietro Pontio, Volume 1
The life, music, and theoretical writings of Pietro Pontio (1532-1596) yield considerable insight into questions of theory and practice in the late sixteenth century. The dissertation places Pontio within his musical and cultural milieu, and assesses his role as both theorist and composer. Volume Two presents an annotated works list for Pontio's compositions, transcriptions of archival documents used in the study, and transcriptions of representative musical compositions.
Date:
December 1989
Creator:
Murray, Russell Eugene
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Proceedings: Human Resources and the Future of the North Texas Economy
Proceedings of a conference on the topic "Human Resources and the Future of the North Texas Economy" held at Midwestern State University including information about the conference, text of speeches, and a list of attendees.
Date:
January 1989
Creator:
Fukasawa, Yoshikazu & Moeller, Warren E.
Object Type:
Book
System:
The Portal to Texas History
An integrated distributed processing interface for supercomputers and workstations
Access to documentation, communication between multiple processes running on heterogeneous computers, and animation of simulations of engineering problems are typically weak in most supercomputer environments. This presentation will describe how we are improving this situation in the Computer Research and Applications group at Los Alamos National Laboratory. We have developed a tool using UNIX filters and a SunView interface that allows users simple access to documentation via mouse driven menus. We have also developed a distributed application that integrated a two point boundary value problem on one of our Cray Supercomputers. It is controlled and displayed graphically by a window interface running on a workstation screen. Our motivation for this research has been to improve the usual typewriter/static interface using language independent controls to show capabilities of the workstation/supercomputer combination. 8 refs.
Date:
January 1, 1989
Creator:
Campbell, J. & McGavran, L.
Object Type:
Article
System:
The UNT Digital Library
Uranium enrichment export control guide: Gaseous diffusion
This document was prepared to serve as a guide for export control officials in their interpretation, understanding, and implementation of export laws that relate to the Zangger International Trigger List for gaseous diffusion uranium enrichment process components, equipment, and materials. Particular emphasis is focused on items that are especially designed or prepared since export controls are required for these by States that are party to the International Nuclear Nonproliferation Treaty.
Date:
September 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
A rosetta stone for connectionism
The term connectionism is usually applied to neural networks. There are, however, many other models that are mathematically similar, including classifier systems, immune networks, autocatalytic chemical reaction networks, and others. In view of this similarity, it is appropriate to broaden the term connectionism. I define a connectionist model as a dynamical system with two properties: the interactions between the variables at any given time are explicitly constrainted to a finite list of connections; the connections are fluid, in that their strength and/or pattern of connectivity can change with time. This paper reviews the four examples listed above and maps them into a common mathematical framework, discussing their similarities and differences. It also suggests new applications of connectionist models, and poses some problems to be addressed in an eventual theory of connectionist systems. 66 refs.
Date:
January 1, 1989
Creator:
Farmer, J.D. (Los Alamos National Lab., NM (USA) Santa Fe Inst., NM (USA))
Object Type:
Article
System:
The UNT Digital Library
Diagnostic development and support of MHD (magnetohydrodynamics) test facilities
Mississippi State University (MSU) is developing diagnostic instruments for Magnetohydrodynamics (MHD) power train data acquisition and for support of MHD component development test facilities. Microprocessor-controlled optical instruments, initially developed for HRSR support, are being refined, and new systems to measure temperatures and gas-seed-slag stream characteristics are being developed. To further data acquisition and analysis capabilities, the diagnostic systems are being interfaced with MHD Energy Center computers. Technical support for the diagnostic needs of the national MHD research effort is being provided. MSU personnel will also cooperate with government agencies and private industries to improve the transformation of research and development results into processes, products and services applicable to their needs.
Date:
July 1, 1989
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Nitrogen oxide abatement by distributed fuel addition. Quarterly report No. 6, November 1, 1988--January 31, 1989
A screening study was performed on a laboratory scale downfired combustor to determine the effect of various variables on the effectiveness of the reburning process as a technique for NO{sub X} abatement. The objective was to define optimum conditions under which reburning can be used and to be able to compare the reburning performance of our combustor to those reported by others. For this purpose, a statistically designed parametric investigation was conducted to determine how a set of controlled variables (primary and secondary stoichiometric ratios, location and length of the reburn zone and primary fuel load) would affect the reduction in NO emissions due to reburning. Also, the effects of other variables (NO in the primary zone, temperatures in the primary, reburn and burnout zones and the residence time in the reburn zone) were also investigated.
Date:
February 28, 1989
Creator:
Wendt, J. O. L. & Mereb, J. B.
Object Type:
Report
System:
The UNT Digital Library
Commercialization of aquifer thermal energy storage technology
Pacific Northwest Laboratory (PNL) conducted this study for the US Department of Energy's (DOE) Office of Energy Storage and Distribution. The purpose of the study was to develop and screen a list of potential entry market applications for aquifer thermal energy storage (ATES). Several initial screening criteria were used to identify promising ATES applications. These include the existence of an energy availability/usage mismatch, the existence of many similar applications or commercial sites, the ability to utilize proven technology, the type of location, market characteristics, the size of and access to capital investment, and the number of decision makers involved. The in-depth analysis identified several additional screening criteria to consider in the selection of an entry market application. This analysis revealed that the best initial applications for ATES are those where reliability is acceptable, and relatively high temperatures are allowable. Although chill storage was the primary focus of this study, applications that are good candidates for heat ATES were also of special interest. 11 refs., 3 tabs.
Date:
September 1, 1989
Creator:
Hattrup, M. P. & Weijo, R. O.
Object Type:
Report
System:
The UNT Digital Library